Gate-pattern.



No. 731,738. PATENTBD JUNE 23, 190s..

- F. H. ARNOLD.

GATE PATTERN. APPLoATIoN FILED JAN. a, 1903.

xo nonni..

\ device by a `citizen of the United States,

`useful FREDERICK H. ARNOLD, on

Patented J une 23, il 903,

y EEICE. i

PATENT READING, PENNSYLVANIA."

GATE-PATTERN.

SPECIFICATION forming part of Letters Patent N o. 731,738, dated June23, 1903.

Application filed January 3, 1903.

.To a/ZZ whom t may concern:

e Beit known that I, FREDERICK H. ARNOLD, residing at Reading, in thecounty of Berks and State of Pennsylvania, have invented certain new andImprovements in Gate-Patterns; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to `which it appertains to make and usethe same.

This invention relates to improvements in gate-patterns, and the objectis to provide a the use of which the dross and dirt contained in themolten metal may be completely screened and prevented from entering thecasting, thus `permitting a thinner `flow of metal than wouldpotherwisebe possi- -ble and preventingrough or spon gy surfaces i on the castingdue to foreign substances in the metal. Y

x To this end my invention consists in the details of construction, ashereinafter more fully described and claimed, and clearly illus- `tratedin the accompanying drawings, in

which- Figure lis an end view, and Fig.'2 a plan f into the maingate-pattern view, of a portion of a pattern-gate with my inventionshown thereon. Referring more particularly to the drawings, the numerall designates the main gatepattern, which may be of `any desired shapeand has, as usual, a number of smaller or feed l i gate-patterns 2,which extend from openings in the sides of the main gate-pattern aboveany metal poured will strike the bottom thereof and divide itself,thereby dowing gradually orby means of gravity through the base thereof,so that Y the feed gate-patterns 2 in opposite directions,

lforced into the pattern 5. `construction I have formed so as to preventthe dross and dirt from being In my present these feed gatepatterns 2 ata slightdownward angle from i their point of connection to the mainportion l, so that the base of said main portion will be somewhathighenthan a horizontal base-line drawnfrom thelower end 4of pattern 2on one side to the pattern on the otherside.

the small gatesame points of the This will insure a free iiow of themolten metal down the inclined portions to all parts of the mold. Thesefeed- `pattern is removed, so

`have no tendency to chill before reaching its patterns 2 are taperedtoward their outer ends,

senti No. 137,65 9. No man.)

and the outer corner of the upper face of each as to form a shoulder 3.From this shoulder the end is curved, as at 4, in an oblique directiontoward the flower and outer extremity to form a reduced narrowportionwhere they join the casting-pattern. The corner 3 checksthe iiowof the upper portion of the molten metal and catches and retains all thedross and drift contained therein as it passes toward the impressionmade in the mold bythe pattern 5, and the curved end 4 will insure theeasy flow of the metal, which being cleaned of all dross and foreignsubstance is practically a puremetal and will not only flow freely, butwill pass from the gates in a fine stream, and thus permit a in uchthinner casting than would otherwise be possible. This screening of thedross from the metal will preventallso-called sandholes and spongysurfaces, which in reality are usually caused by dross or foreignsubstances in the metal. The screening iseffectually accomplished by mypresent construction, as4 the foreign substancesin the metal beinglighter than the metal itself will ride on the surface, and as itreaches the shoulder 3 in the feed-gates it will be arrested andprevented from passing into the casting proper; but the pure metalIiowing beneath will pass ont freely and in a ne stream, thus insuringclean perfect castings,

It will be noticed that the point of connection between the gates andthe castings is not thickened, as the dross is taken from the metalimmediatelybefore it reachesthis point, leaving the point of junctionthin and easy to sever.

By the use of my invention the metal lwill destination, as the volume iskept comparatively large and bulky until just prior to its entering thecasting-that is, just as it leaves the curved ends of the gates 2-andthen it will be purified and can liow more freely than metal that hasnot been screened.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, iS Ioo l. A device of the class described,comprising a main gate-pattern and a plurality of outwardly anddownwardly inclined feed-gatepatterns extending from the sides thereofand independent of the base of said main gatevided with a shoulder ontheir upper face, pattern, the outer corner of the upper porand a curvedend extending obliquely from tion of said feed gate-patterns beingremoved vsaid shoulder toward the base to form a reto form a reducedlower extremity. duced outer extremity.

5 2. A device of the class described, oompris- In testimony whereof Iaffix my signature 15 ing a main gate-pattern and a plurality of inpresence of two Witnesses. downwardly-inclined tapering feed gate-pat-FREDERICK H. ARNOLD. terns radiating from the sides thereof and'in-Witnesses: dependent of the base of the main gate-pat- ED. A. KELLY,

io tern, said feed gate-patterns each beinfr pro- GEO. M. MILLER.

